JP2004360343A - Construction method for small sectional underground structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for a small sectional underground structure capable of making small outer dimensions while ensuring required inner dimensions, making small shaft dimensions by them and also keeping a material cost of lining elements used for a body construction at a low price. <P>SOLUTION: A large number of long lining elements are arranged to penetrate them into a bedrock to construct a lining structural body including an upper floor slab and a side wall by connecting the lining elements adjacent to each other to utilize the lining structural body as an underground structure body. As the lining elements 1 and 2, substances consisting of body elements 3 and 7 and hollow working elements 4 and 8 detachably fixed to the insides of the body elements 3 and 7 are used, the lining structural body 20 is constructed by successively penetrating the lining elements 3 and 7 into the bedrock while connecting them to each other at the end sections of the body elements 3 and 7, and after then, the bedrock inside of the lining structural body is excavated to remove the working elements 4 and 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for constructing a small-section underground structure, and more particularly, to a small-section underground structure such as a humanitarian box or a waterway that traverses a ground below a vehicle traveling path such as a railway track or a road. (Tunnel) construction method.
[0002]
[Prior art]
FIG. 6A shows a small-section underground structure 50 such as a humanitarian box or a waterway constructed by a conventional method. When constructing this underground structure, one hollow reference element 51 having a rectangular cross section and a number of general section elements 52 having a U-shaped cross section are used as lining elements. First, the reference element 51 penetrates the ground, and then penetrates the ground while connecting the opening side of the general part element 52 to both sides.
[0003]
Furthermore, it penetrates the ground while connecting the opening side of the following general part element 52 to the closed part side of the general part element 52 that has previously penetrated the ground. Hereinafter, similarly, the general section elements 52 are sequentially penetrated into the ground, and a lining structure having the upper floor slab 53, the side wall 54, and the lower floor plate 55 is constructed. Then, the ground inside the lining structure is excavated, and the lining structure is used as a main body structure, that is, an underground structure 50. Each of the elements 51 and 52 has a substantially C-shaped JES (Jointed Element Structure) joint that is rigidly connected by fitting, and an element having this joint is called a JES element. In FIG. 6A, reference numeral 56 denotes decorative concrete that defines the internal dimensions of the underground structure 50.
[0004]
The lining elements 51, 52 are connected to a cutting edge element (not shown) provided with an excavator, and penetrate the ground by traction (or propulsion). If an obstacle such as a boulder that hinders excavation appears near the blade element during towing work, the obstacle is removed through the inside of these lining elements 51 and 52. As described above, the conventional lining element is premised on having a function of removing obstacles, and therefore has a large cross-sectional area and is uneconomical. In addition, as a result of the increase in the outer dimensions of the underground structure 50, there is also a problem that the shaft becomes large.
[0005]
[Problems to be solved by the invention]
The present invention has been made based on the technical background as described above, and achieves the following objects.
SUMMARY OF THE INVENTION It is an object of the present invention to reduce the outer dimensions while securing the required inner dimensions of an underground structure, thereby reducing the vertical shaft dimensions, and to provide a lining element used as a main structure. It is an object of the present invention to provide a method of constructing a small-section underground structure capable of keeping material costs low.
[0006]
[Means for Solving the Problems]
The present invention employs the following means to achieve the above object.
That is, the present invention constructs a lining structure including an upper floor slab and a side wall by connecting a plurality of long lining elements in parallel and penetrating into the ground and connecting adjacent lining elements. In a construction method using the lining structure as an underground structure main body,
As the lining element, use is made of a body element and a hollow working element detachably fixed to an inner surface of the body element,
Constructing the lining structure by sequentially penetrating the ground while connecting the lining elements to each other at the ends of their body elements,
Thereafter, a method for constructing a small-section underground structure is characterized in that the ground inside the lining structure is excavated and the working element is removed.
[0007]
More specifically, the main body element is provided with a joint extending in the longitudinal direction of the element inside and outside the end portion, and the main body element is connected by fitting the joint. A hollow bag is arranged between the ends of the respective main body elements connected by the joint, and the grout material is filled into the fitting space of the joint with the bag inflated. A hollow bag may be arranged between the ends of the body elements connected by the joint, and the fitting portion of the joint may be held in a tensioned state by inflating the bag.
[0008]
The lining element includes a corner element applied to a corner of the lining structure, and a general element applied between the corner elements, wherein the corner element has a predetermined shape. An L-shaped cross section main body element having a width and a hollow work element having a quadrangular cross section which is detachably fixed to an inner surface of the main body element, wherein the general section element has an I-shaped cross section having a predetermined width. It consists of a body element and a hollow working element with a rectangular cross section which is removably fixed to the inner surface of the body element.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are front views (cross-sectional views in a direction perpendicular to the element axis) showing a lining element used in the method of the present invention. The corner element 1 is long and made of steel, and as shown in FIG. 1, comprises a hollow main element 3 having a predetermined width and an L-shaped cross section, and a hollow working element 4 having a rectangular cross section. Have been.
[0010]
Joints 5 extending along the longitudinal direction of the element are provided inside and outside both ends of the main body element 3. The joint 5 is a JES (Jointed Element Structure) joint which has a substantially C-shaped cross section and is rigidly connected by fitting the joints to each other. The working element 4 is arranged inside the main body element 3 and is detachably fixed to the inner surface of the main body element 3 by a number of bolts and nuts 6. The corner element 1 has a square cross section as a whole with the working element 4 attached to the main body element 3 in this way.
[0011]
The general section element 2 is also long and made of steel, and as shown in FIG. 2, comprises a hollow main body element 7 having a predetermined width and an I-shaped cross section, and a hollow working element 8 having a rectangular cross section. Have been. Joints 9 extending along the longitudinal direction of the element are provided inside and outside both ends of the main body element 7. The joint 9 is a JES joint similar to the joint 5 provided on the corner element 1 and can be fitted to the joint 5. The working element 8 is arranged inside the main body element 7 and is detachably fixed to the inner surface of the main body element 7 by a number of bolts and nuts 6. The general element 2 has a rectangular cross section as a whole with the working element 8 attached to the main body element 7 in this way.
[0012]
In the corner element 1 and the general element 2, the dowel 10 provided inside the main body elements 3, 7 increases the adhesive force with the concrete cast into the main body elements 3, 7 to cover. This is for increasing the strength of the engineered structure.
[0013]
FIG. 3 and FIG. 4 are cross-sectional views showing a method of constructing a small-section underground structure on the ground under the track 11 using the corner element 1 and the general element 2. After starting and reaching shafts (not shown) are constructed on both sides of the track 11, the element penetrates into the ground between the starting and reaching shafts. The penetration of the element may be by traction or propulsion. Although not shown, a cutting element provided with an excavator is connected to the tip of the element.
[0014]
The specific penetration order of the elements may take various forms. For example, first, in order to construct the upper floor slab 12, these elements are arranged in the order of the corner element 1, the general element 2 and the corner element 1. Sequentially penetrate the ground. At this time, the joint 5 (or 9) of the element that has previously penetrated into the ground and the joint 9 (or 5) of the element that has penetrated into the ground have been fitted (see FIG. 5), and Elements to be connected. Hereinafter, similarly, in order to construct the side wall 13, the general part element 2 and the corner part element 1 sequentially penetrate into the ground. When each element constituting the upper floor slab 12 has penetrated, and when each element constituting the side wall 13 has penetrated, concrete is poured into the inside of the main body elements 3 and 7.
[0015]
If an obstacle such as a boulder appears near the tip of the blade element during the penetration operation of the element as described above, the obstacle is removed to the outside through the working elements 4 and 8. For this reason, the working elements 4 and 8 have a size that allows a worker to enter the inside.
[0016]
After penetrating the lower corner element 1 of the side wall 13, the cover elements 14, 15 penetrate the ground between the upper and lower corner elements of the two corner elements 1, 1, and penetrate between the cover elements 14, 15 while penetrating. The ground is excavated to expose the joint 5 of the corner element 1,1. Then, the joint 17 of the plate-shaped adjustment element 16 is fitted to the exposed joint 5, and the corner elements 1, 1 are connected by the two adjustment elements 16, 16. As a result, the lower floor plate 18 is formed by the corner element 1 and the adjusting element 16, and concrete is cast inside the main body element 3 and the adjusting elements 16, 16 constituting the lower floor plate. Thus, the box-type lining structure 20 is constructed.
[0017]
Then, as shown in FIG. 4, the ground inside the lining structure 20 is excavated, and with the excavation, the working elements 4 and 8 of the corner element 1 and the general element 2 are removed and removed. The upper cover element 15 is also removed. After the excavation is completed, decorative concrete 21 is applied to the inner surface of the lining structure 20 composed of the main body elements 3 and 7 and the adjusting elements 16 and 16, and the underground structure using the lining structure 20 as a main body in this way. Is constructed. The removed working elements 4 and 8 are reused without being discarded.
[0018]
FIG. 6 is a diagram comparing the underground structure 50 constructed by the conventional method and the underground structure 20 constructed by the method according to the present invention when the internal dimensions are the same. According to the construction method according to the present invention, the outer dimensions of the underground structure can be extremely reduced as compared with the conventional method. Therefore, the shaft size can be reduced, and the construction cost can be reduced. In addition, the size of the element used as the main structure is reduced as a result, and the material cost can be reduced.
[0019]
In the element using the JES joints 5, 9, the treatment of the gap at the fitting portion of the joint is extremely important in order to expect the rigid connection between the elements. FIG. 5 is a sectional view showing the processing method. A hollow bag 22 extending along the longitudinal direction of the element is arranged between the ends of the body elements 3, 7 connected by the joints 5, 9. With the hollow bag 22 inflated, grout is injected into the gaps between the fitting portions of the joints 5 and 9. Thereby, leakage of the grout material can be prevented. In order to inflate the hollow bag 22, air may be injected into the bag, or mortar may be injected. Further, the fitting portion of the joint may be held in a tensioned state by inflating the hollow bag 22 by the above-described means without injecting the grout material into the gaps of the fitting portions of the joints 5 and 9.
[0020]
The above embodiments are merely examples, and the present invention can take various aspects. For example, in the above embodiment, a steel JES element is shown as the main body element, but the present invention is not limited to this, and a reinforced concrete or prestressed concrete element can be used as the main body element. In the above embodiment, one general part element 2 is disposed between the corner elements 1 and 1. However, a plurality of general part elements 2 may be disposed.
[0021]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce the external dimensions while securing the required internal dimensions of the underground structure, thereby reducing the vertical shaft dimensions and reducing the construction cost. be able to. Further, the material cost of the lining element used as the main body structure can be reduced.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a corner element.
FIG. 2 is a sectional view showing a general element.
FIG. 3 is a sectional view showing an embodiment of a method for constructing an underground structure according to the present invention.
FIG. 4 is a sectional view showing the same embodiment following FIG. 3;
FIG. 5 is a cross-sectional view showing a fitting part process of the joint.
FIG. 6 is a cross-sectional view comparing underground structures constructed by a conventional method and a method according to the present invention.
[Explanation of symbols]
1: Corner element 2: General part element 3: Body element 4: Work element 5: Joint 6: Bolt / nut 7: Body element 8: Work element 9: Joint 10: Gibber 11: Line 12: Upper floor plate 13: Side wall 16: Adjusting element 18: Lower floor plate 20: Lining structure (underground structure)
21: decorative concrete 22: hollow bag

Claims (5)

A plurality of long lining elements are juxtaposed to penetrate the ground, and the adjacent lining elements are connected to construct a lining structure including an upper floor slab and a side wall. In the construction method using the as the underground structure body,
As the lining element, use is made of a body element and a hollow working element detachably fixed to an inner surface of the body element,
Constructing the lining structure by sequentially penetrating the ground while connecting the lining elements to each other at the ends of their body elements,
Thereafter, a method for constructing a small-section underground structure, characterized by excavating the ground inside the lining structure and removing the working element. 2. The small underground structure according to claim 1, wherein a joint extending along the longitudinal direction of the element is provided inside and outside the end of the body element, and the body elements are connected by fitting the joint. How to build things. The hollow bag is arranged between the ends of the main body elements connected by the joint, and grout material is filled in a fitting portion gap of the joint in a state where the bag is inflated. How to build a small section underground structure. 3. A small cross-section according to claim 2, wherein a hollow bag is arranged between the ends of the body elements connected by the joint, and the fitting portion of the joint is held in a tensioned state by inflating the bag. How to build underground structures. The lining element includes a corner element applied to a corner of the lining structure, and a general element applied between the corner elements.
The corner element is composed of a body element having an L-shaped cross section having a predetermined width and a hollow work element having a rectangular cross section which is detachably fixed to an inner surface of the body element,
2. The general element according to claim 1, wherein the general element comprises a main body element having an I-shaped cross section having a predetermined width and a hollow work element having a rectangular cross section which is detachably fixed to an inner surface of the main body element. 5. The method for constructing a small-section underground structure according to any one of items 1 to 4.

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